Aluminum-containing thermal pastes

Abstract

A crosslinkable, heat-conducting silicone composition along with processes for producing and uses for the same. Where the composition includes 5-50% by volume of a crosslinkable silicone composition (S) and 50-95% by volume of at least one thermally conductive filler (Z) having a thermal conductivity of at least 5 W/mK. Where the crosslinkable heat-conducting silicone composition has a thermal conductivity of at least 0.6 W/mK and at least 20% by volume of metallic aluminum particles present as thermally conductive fillers (Z).

1 - 14 - (canceled) 
     
     
         15 . A crosslinkable, heat-conducting silicone composition (Y), comprising:
 wherein 5-50% by volume of a crosslinkable silicone composition (S);   wherein 50-95% by volume of at least one thermally conductive filler (Z) having a thermal conductivity of at least 5 W/mK;   wherein the crosslinkable heat-conducting silicone composition (Y) has a thermal conductivity of at least 0.6 W/mK;   wherein at least 20% by volume of metallic aluminum particles present as thermally conductive fillers (Z), wherein the thermally conductive fillers (Z)
 a) have a median diameter x50 is in the range of 30-150 μm, 
 b) they are produced in the last production step via a melting process and have a predominately rounded surface shape, and 
 c) their distribution range SPAN ((x90−x10)/x50) is at least 0.40. 
   
     
     
         16 . The composition of  claim 15 , wherein it is an addition-crosslinking silicone composition. 
     
     
         17 . The composition of  claim 15 , wherein it contains at least 25% by volume of metallic aluminum particles as thermally conductive fillers (Z). 
     
     
         18 . The composition of  claim 15 , wherein it contains only one or two further thermally conductive fillers (Z) aside from the metallic aluminum particles. 
     
     
         19 . The composition of  claim 15 , wherein less than 16% by weight of a further thermally conductive filler (Z) having a density of greater than 5.0 g/cm 3  is present. 
     
     
         20 . The composition of  claim 15 , wherein the median diameter x50 of the metallic aluminum particles is in the range of 40-130 μm. 
     
     
         21 . The composition of  claim 15 , wherein the metallic aluminum particle contains less than 20% by weight of a particle fraction having a diameter of not more than 20 μm based on the total amount of aluminum particles. 
     
     
         22 . The composition of  claim 15 , wherein it has a thermal conductivity of at least 0.8 W/mK. 
     
     
         23 . The composition of  claim 15 , wherein it has a dynamic viscosity of 1000-750 000 mPa·s, in each case at shear rate D=10 s −1  and 25° C. 
     
     
         24 . The composition of  claim 15 , wherein the crosslinkable, heat-conducting silicone composition (Y) is a gap filler (=heat-conducting element), heat-conducting pad, heat-conducting adhesives and encapsulating compounds. 
     
     
         25 . The composition of  claim 15 , wherein the crosslinkable, heat-conducting silicone composition (Y) is a gap filler for lithium-ion batteries of electrical vehicles. 
     
     
         26 . The composition of  claim 15 , wherein the crosslinkable, heat-conducting silicone composition (Y) is a encapsulating compound electrical vehicles. 
     
     
         27 . A process for producing a crosslinkable, heat-conducting silicone composition (Y), comprising:
 providing a composition having 5-50% by volume of a crosslinkable silicone composition (S) and 50-95% by volume of at least one thermally conductive filler (Z) having a thermal conductivity of at least 5 W/mK;
 wherein the crosslinkable heat-conducting silicone composition (Y) has a thermal conductivity of at least 0.6 W/mK; 
 wherein at least 20% by volume of metallic aluminum particles present as thermally conductive fillers (Z), wherein the thermally conductive fillers (Z)
 a) have a median diameter x50 is in the range of 30-150 μm, 
 b) they are produced in the last production step via a melting process and have a predominately rounded surface shape, and 
 c) their distribution range SPAN ((x90−x10)/x50) is at least 0.40; and mixing the individual components. 
 
   
     
     
         28 . The process of  claim 27 , wherein the crosslinkable, heat-conducting silicone composition (Y) is obtainable by dispensing or applying and then curing the inventive crosslinkable silicone compositions. 
     
     
         29 . The process of  claim 27 , wherein the crosslinkable, heat-conducting silicone composition (Y) is a gap filler (=heat-conducting element), heat-conducting pad, heat-conducting adhesives and encapsulating compounds. 
     
     
         30 . The process of  claim 27 , wherein the crosslinkable, heat-conducting silicone composition (Y) is a gap filler for lithium-ion batteries of electrical vehicles. 
     
     
         31 . The process of  claim 27 , wherein the crosslinkable, heat-conducting silicone composition (Y) is a encapsulating compound electrical vehicles.